Synthesis and antimicrobial activity of pyridopyrazole and pyrazolo[3,4-d]dihydrothiazole

6-Methyl-1,3-dihydro-4H,7H-pyrazolo[2,3-c]pyridine-4-one (4) were synthesized by microwave as well as conventional method. The reaction time reduced 10 times than that of conventional method. The pyrazolo[3,4-d]dihydrothiazole (8) were synthesized by reacting phenylisothiocyanate with 1-carbethoxy-5-amino-pyrazol-4-ene-3-one and were screened for their antimicrobial activities.